Method, system and apparatus for non-destructive testing (ndt) of electrical power line systems

ABSTRACT

A system for non-destructive testing of an overhead energized electrical component. The system has a base, an X-ray source, an X-ray digital imager, and an imager controller. The system also has a removable electrically conductive flexible shield which is adapted to be operatively coupled to, and to encapsulate, at least the base, the X-ray source, the X-ray digital imager and the imager controller so as to form a shrouded system. In a use position, when the shrouded system is positioned adjacent the energized electrical component so as to non-destructively test the energized electrical component, the shield protects at least the base, the X-ray source, the X-ray digital imager and the imager controller from electric fields around the energized electrical component while allowing signal communication between at least the X-ray source and the energized electrical component.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority from U.S. Provisional PatentApplication No. 62/573,563, filed on Oct. 17, 2017 and Canadian PatentApplication No. 2,982,679 filed on Oct. 17, 2017, both entitled,“Method, System And Apparatus For Non-Destructive Testing (NDT) OfElectrical Power Line Systems”, entireties of which are incorporatedherein by reference.

FIELD

Embodiments described herein generally relate to an apparatus and methodfor non-destructive testing of overhead electrical power line systems.More particularly, embodiments described herein relate to an apparatusand method for non-destructive testing of energized electricalcomponents of said power line systems including but not limited tooverhead electrical conductors, static lines, optical ground wires orsubstation bus pipes and their associated couplings/couplers.

BACKGROUND

Nondestructive testing (NDT) to identify defects in various electricalcomponents of overhead electrical power line systems is known. NDT isoften considered a preferred testing method as NDT allows for testingwithout destroying an object so that material qualities of an object canbe examined, tested and studied without taking the object apart. NDT maybe undertaken at various stages in the life cycle of an electricalcomponent, for example, NDT may be undertaken during manufacture of theelectrical component or during construction of an electrical powersystem to ensure that the electrical component is assembled correctlyduring said construction or during maintenance of the electrical powersystem to detect deterioration in the electrical component produced bythe operating conditions or any combination of these stages. The defectsdetected by NDT may include but are not limited to structural flaws suchas cracks, dents or pits in the electrical component, installation flawsincluding incorrect contact between the electrical component and acooperating component or structure or development of leakage path(s) onthe electrical component or between the electrical component and acooperating component or structure. Ensuring the integrity of electricalpower line systems, specifically where, the electrical power systems areconducting high or transmission class voltages in the range of 69 kV toover 500 kV is particularly important. NDT has proven to be a usefulmethod for quality control in electrical power applications, in whichcomponent failure could have catastrophic results.

The terms “electrical component” or “electrical power line component” asused herein is understood to include electrical power line cables orwire products including electrical conductors, static lines, opticalground wires (OPGWs) or substation bus pipes and couplings or couplersassociated with said cables. The terms “electrical component” or“electrical power line components” also include piece parts and devicesincluding electrical components incorporating an insulating materialsuch as an outdoor insulator. For ease of reference, electricalconductors, static lines, optical ground wires (OPGWs) or substation buspipes are interchangeably referred to herein as “power line cabling” or“power line cable” or “power line conductor”. Couplings may include butare not limited to compression sleeves which join ends of two power linecables together or dead-ends or dead end connectors which are used toattach power line cables to supporting structures such as support towersor poles.

U.S. Pat. No. 9,488,603 to Stock discloses a portable system fornon-destructive testing of overhead electrical power-line equipment(herein referred to as the Stock system). The system includes an X-raysystem and a support unit. All the components of the X-ray system aremounted to a base of the support unit. The support unit further includesa plurality of attachment members. In use, the plurality of attachmentmembers suspends the support unit from an overhead power line so as tolocate the base and at least a portion of the X-ray system below theobject such as power line or coupler to be imaged. The X-ray systemincludes an X-ray source which is mounted to the base. The X-ray sourceprovides X-rays which penetrate the object to be imaged. The X-rayspassing through the object are captured by a digital imager which, inthe use position, is positioned substantially on an opposing side of theobject (as compared to the X-ray source). The digital imager processesthe captured X-rays and creates a digital image which is representativeof the state of the object and any defects that may exist therein.Wireless communication with a remote computer to transmit the digitalimages is also disclosed.

Applicant believes that the Stock system cannot be safely used withoutmodification when the power line is energized.

Further, Applicant believes that the Stock system may not be conducivefor testing components in a crowded environment such as an electricsubstation where anchoring of the Stock system on the object to beimaged may not be possible or may be difficult. An electric substationis a junction where usually more than two power line cables terminate.In large electric substations the total number of power line cablesterminating exceeds one or two dozen. The terminating power line cablesconnect to bus conductors or bus pipes in the electric substation.Electric substations are typically crowded as they contain a multitudeof components such as support structures for the terminating power linecables and bus pipes, switches, capacitor banks and/or transformers.

Applicant believes that use of the Stock system to test components suchas power line cables or bus pipes in an electric substation or overheadpower line systems presents the following problems; firstly, in order touse the Stock system, the overhead power line systems or substation mustbe shut down in order to de-energize the power line conductors or buspipes. This is not efficient as shutdown would result in a power outage.

The Stock system requires suspension of the NDT equipment from theobject to be imaged, for example from a power line conductor or buspipe. In an electric substation or overhead power line system, due tothe often tight spacing between various electrical components andbecause the Stock system has a large physical footprint, it may bedifficult to maneuver the Stock system so as to suspend it from theobject to be imaged without risk of snagging onto surrounding electricalcomponents and thereby causing electrical incidents.

Applicant further believes that the Stock system may not prove useful ininstances where orientation of an electrical component or a lack ofstrength of the electrical component does not safely allow forsuspension of the Stock system's equipment from the electrical componentto be imaged. For example, in order to suspend the Stock system, theelectrical component to be imaged must be substantially horizontal.Also, the electrical component must be sufficiently strong to supportthe weight of the Stock system (approximately 30 to 35 lbs.) as theStock system requires suspension from the electrical component.

Therefore, there is a need for an apparatus and corresponding methodemploying the apparatus, which can test electrical components in asub-station or elsewhere while the components are in an energized state,irrespective of their location or orientation in an overhead electricalpower line system.

SUMMARY

Accordingly in one aspect, a system for non-destructive testing of anenergized electrical component which is supported in an overheadposition in an electrical power line system is provided. The systemcomprises an elongate base having a first end and a second end and alength therebetween. The system further comprises an X-ray sourceadapted to be mounted on the base at about its first end, and an X-raydigital imager adapted to be mounted on the base at about its secondend. When so located, the X-ray source and the X-ray digital imager arein an operative opposed facing spatial relationship. The system alsocomprises an imager controller adapted to be mounted to the base, and aremovable electrically conductive flexible shroud or shield as usedinterchangeably herein and better described herein below. The shield isadapted to be operatively coupled to, and to encapsulate, at least thebase, the X-ray source, the X-ray digital imager and the imagercontroller. In one embodiment, the electrically conductive flexibleshield is also further adapted to be releasably coupled to a live-linetool. In a use position when the shield is coupled to and encapsulatesat least each of the base, the X-ray source, the X-ray digital imagerand the imager controller to form an electrically shrouded system, andthe shrouded system is releasably coupled to the live-line tool, theshrouded system is positionable adjacent the energized electricalcomponent so as to non-destructively test the energized electricalcomponent. During testing, at least the base, the X-ray source, theX-ray digital imager and the imager controller are shielded fromelectric fields around the energized electrical component by the shield.The shield allows the passing of the X-ray frequency radiation from theX-ray source to the digital imager, while passing through the shield andobject to be imaged. The shield also allows RF signal communicationbetween the shrouded system and an external receiver while the wirelesstransmitter is shrouded within the shrouded system.

Accordingly in another aspect, a method for non-destructive testing ofan energized electrical component which is supported in an overheadposition in an electrical power line system is provided. The methodcomprises locating an X-ray source and an X-ray digital imager on anelongate base in an opposed facing spatial relationship, and connectingan imager controller to the base. The method further comprisesencapsulating at least each of the base, the X-ray source, the X-raydigital imager, the imager controller and a wireless transmitter withina removable electrically conductive flexible shield to form a shroudsubstantially completely thereover. Further, in one aspect the methodcomprises releasably coupling the base to a live-line tool, and couplingthe shroud thereto. The live-line tool is used to position the shroudand its shrouded system adjacent the energized electrical component fornon-destructive testing of the energized electrical component. Duringtesting, at least the base, the X-ray source, the X-ray digital imager,the imager controller and the wireless transmitter are shielded fromelectric fields around the energized electrical component. Again, theshield allows RF signal communication between the shrouded system and anexternal receiver while also allowing simultaneous X-ray radiation ofthe object to be imaged through the shroud.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of one embodiment of a system fornondestructive testing (NDT) of an energized electrical component, theview showing the various components of the shrouded system, namely abase, an X-ray source, an X-ray digital imager, an imager controller,and a RF communication interface and also shrouding the electricallyconductive flexible shroud, wherein in this view, the flexible shroudhas been illustrated in a lowered, non-encapsulating position so as toallow view of the system therein;

FIG. 2 is a perspective view of the system of FIG. 1 looking from an endof the system;

FIG. 3 is a perspective view of the system of FIG. 1 without the X-raysource and the communication interface installed;

FIG. 4 is a perspective view of the system of FIG. 1 with the flexibleshroud in its encapsulating position;

FIG. 5 is a schematic view illustrating the system of FIG. 1 in a useposition according to an embodiment wherein the system of FIG. 1 ismaneuvered into its use position using a live-line tool supported on asupport structure;

FIG. 6 is a schematic view illustrating the system of FIG. 1 in a useposition according to another embodiment, wherein, the system of FIG. 1is anchored to a live-line tool which is in turn is held suspended froman aerial lift platform such as a bucket truck;

FIGS. 7A to 7D are digital (X-ray) images produced by the systemdescribed herein of defective energized conductors;

FIGS. 7A1 to 7D1 are line drawing depictions of the X-ray images ofFIGS. 7A to 7D, respectively; and

FIG. 8 is an enlarged view of a portion of the flexible shroud of FIG. 1according to one embodiment.

DETAILED DESCRIPTION

Embodiments described herein relate to a system and apparatus whichenables non-destructive testing (NDT) of electrical power linecomponents while they are live or energized. The system described hereinenables testing while the system is directly suspended from the powerline component being tested and also enables testing of electrical powerline components without the system being physically connected to oranchored on the electrical power line components to be tested.

Although the system and method disclosed herein have been primarilyexplained in the context of energized overhead electrical power systems,the system and method may also be used for non-destructive testing ofunderground conductors, equipment or apparatus, terminators andassociated components.

Use of the system and apparatus of the present embodiments have beendescribed herein with reference to energized bus pipes 100 forming partof an electric substation 102 wherein the bus pipes 100 conduct voltageswhich may be in the range of 13.8 kV to 765 kV. Because the bus pipesare energized, significant electric fields exist around them. However,as one skilled in the art will appreciate, the system and apparatus mayalso be used to test other energized electrical power line components,for example, overhead electrical conductors, static lines or opticalground wires (OPGWs). Further, even though most embodiments describedherein teach testing of energized electrical power line components, thepresent system and apparatus may also be used to test electrical powerline components when they are de-energized, but the usefulness isprimarily realized during testing of energized power line components.

FIGS. 1 to 4 illustrate a NDT system according to one embodiment. Thesystem 10 includes an elongate base 12 having a first end 12 a and asecond end 12 b. The first and second ends, 12 a and 12 b, respectivelyare spaced apart by a length. The elongate base 12 is substantiallyplanar to support thereon other components of the system 10, althoughthis is not intended to be limiting as the base may be other than planaror other than a single unitary structure. In one embodiment, and as seenin the accompanying figures, the base may be a T-shaped plate in planview and includes a flange 14 and an elongate leg 16 extendingperpendicularly from a center of the flange 14. The first end 12 a ofthe base 12 is at the distal free end of the leg 16, distal from theflange. The second end 12 b of the base 12 includes the free end of theflange 14, opposite first end 12 a.

The system 10 further includes an X-ray source 18. The X-ray source 18is mounted on the base 12, preferably, at its first end 12 a. The X-raysource 18 may include a power supply such as a battery (not shown) foron-demand emission of X-rays from the X-ray source.

The system 10 further includes an X-ray digital imager 20 which is alsomounted on the base 12. Preferably, the X-ray digital imager 20 ismounted on the base 12 at its second end 12 b. The X-ray source 18 andthe X-ray digital imager 20, when so located, are in an opposed facingspatial relationship so that the imager captures images of the X-raysfrom the source which have passed through the electrically conductiveshroud and an object, such as pipe 100, being imaged. In one preferredembodiment, the X-ray digital imager 20 is a flat panel digital imager.

The X-ray digital imager 20 is associated with an imager controller 22.The imager controller 22, in one embodiment, is mounted on a supportplate 24 associated with the base 12. The support plate 24 underlies thefirst end 12 a and the leg 16 of the base 12 and extends at least alonga length of the leg 16.

Suitable X-ray sources, digital imagers and imager controllers such asthose manufactured and sold by Vidisco Ltd. of Or-Yehuda, Israel,including those sold under trademarks FLAT FOX-17™ and FOX-RAYZOR™ maybe used in the system described herein.

In one embodiment, the system 10 may further comprise a communicationinterface 26 for communicating with a remote processing unit 28 (bestseen in FIG. 5). In one embodiment, the communication interface 26 is aradio frequency wireless interface which includes an antenna 26 a.

In one embodiment, the system 10 may include a cooling fan (not shown).

In order to obtain good quality images of the component to be imaged,e.g., the energized bus pipe 100, the system 10 must be positionedadjacent to the bus pipe 100 so as to position the bus pipe between theX-ray source and digital imager. As stated above, since the bus pipe 100is energized, significant electric fields exist around the bus pipe 100.Accordingly, in one embodiment, in order to protect the system 10 fromthe significant electric fields around the bus pipe 100, beforeattaining an in-use or operative position adjacent the bus pipe 100, thesystem 10 is substantially entirely encased or shrouded within aflexible electrically shielding shroud which acts as a Faraday cagearound all of the above described components of system 10. As oneskilled in the art will understand, a Faraday cage operates so that noexternally originating electrical charge will flow through the cage andthat, instead, all of the electrical charge originating from theexternal source (in this case, electric fields surrounding the bus pipe100) will be confined to, and flow around, an outer surface of the cage.Therefore, when the shroud, forming a Faraday cage, encapsulates orencases the above-described components, they will be protected from theharmful effects of the electric fields surrounding the bus pipe 100.

Applicant recognized that in order for the system 10 to function asdesired when located proximal to the energized component (i.e. captureclear and mostly undistorted images of the energized component andtransmit the captured images to a remote processing unit via thecommunication interface), the shroud should have at least the followingcharacteristics, ability to attenuate an external electric field suchthat the components shielded by the cover are not harmed; and allowsboth wireless signal communication between the communication interfacefor example an RF transmitter and an external receiver located remotelyfrom the system and its shroud. For example, where the communicationinterface is a RF wireless interface, the shroud in addition toperforming a Faraday cage function around system 10, must also allowtransmission of both X-ray and radio frequency (or other wirelesscommunication frequencies) to pass simultaneously through it.

Applicant experimented with a number of ways for making the shroud. Forexample, Applicant tried constructing the shroud from a wire mesh withgaps or holes having a width of approximately one half inch. However,this configuration of the Faraday cage did not work in the energizedenvironment described herein as in this experiment the RF communicationdid not function properly. Based on further testing it was discoveredthat when the shroud was formed of a material used for making so-calledbarehand suits, performance of the shroud improved. As one skilled inthe art will understand, barehand suits are typically worn by linemenwhile conducting bare-hand live-line work on energized transmissionlines and are typically may be made from a material including a blend offire retardant components and metallic threads. An example of a barehandsuit material is the product manufactured and sold by Alsico USA underthe trademark Euclid Vidaro's KV-Gard®. The KV-Guard product includes75% NOMEX®, a fire retardant component, and 25% stainless-steel threads.

Based on further experimentation Applicant discovered that when thebarehand suit material, for example the non-electrically conductivethreads and the metallic threads 50 are woven in a grid pattern such asthe illustrated herringbone pattern in FIG. 8 (when the relative size ofthe repeating weave pattern is approximately 15 mm to 20 mm in avertical direction in the approximately fifteen times magnification ofFIG. 8, and 10 mm in a horizontal direction in FIG. 8), the shroudeffectively formed a Faraday cage around the system 10 in the energizedenvironment described herein while allowing radiation in the X-ray andWi-Fi frequencies to pass through the shroud.

In FIG. 8, each herringbone in the weave pattern is an interwoven blendof non-electrically conductive threads (e.g. fire retardant threads) andelectrically conductive threads 50. Conductive threads 50 may be metalthreads such as made from stainless steel or silver.

Thus, in one embodiment, the shroud 30 is a removable, electricallyconductive, flexible shroud formed from a herringbone weave ofconductive and non-electrically conductive threads. Shroud 30 may beformed as a customized or specialized form-fitted cover which is cut toa geometric form or shape corresponding to a geometric form or shape ofthe base 12 when the base is fitted with the components of system 10 soas to substantially fully, or fully encapsulate the system. It will beappreciated that the accompanying drawings only illustrate onerepresentative shape of the flexible shroud 30. This is not intended tobe limiting.

Shroud 30 is adapted to be operatively coupled so as to be electricallyconductively coupled to the components of the system 10. Accordingly,one or more fastening elements may be provided on an inside surface 30 aof shroud 30 for operatively coupling shroud 30 to its encapsulatedsystem 10; namely, at least each of the base 12, the X-ray source 18,the digital imager 20, the imager controller 22, the communicationinterface 26 and an antenna 26 a. As shown in the figures, the one ormore fastening elements may be electrically conductive straps 32 whichmay be wrapped around one or more of the above-stated components foroperatively coupling shroud 30 to those components. Prior to the system10 attaining or being positioned into its in-use position, all of thecomponents of the system 10 including those stated above are entirelyencased within the flexible shroud 30 to form a shrouded system 10 a.

Operation of the shrouded system 10 a will now be described withreference to FIGS. 5 and 6.

As stated above, the system 10 may be used to non-destructively test buspipes 100 in an electric substation 102. The bus pipes 100 are thus inan overhead position and energized. Testing may be undertaken, forexample as a pre-set quality control process, to understand the currentstate of the bus pipes 100 and to identify any defects not visible tothe eye that may be present in them.

After the various components of the system 10 have been mounted on thebase 12 in the arrangement described above, the flexible shroud 30 isoperatively coupled to each and every component of the system 10, forexample to include the base 12, the X-ray source 18, the digital imager20, the imager controller 22, the communication interface 26 and theantenna 26 a. As described above, coupling may be achieved by wrappingthe straps 32 around each and every component of the system 10. All theabove-stated components of the system 10 are then entirely encasedwithin the flexible shroud 30 to form the shrouded system 10 a.

The shrouded system 10 a is then gripped or supported by a live-linetool such as a hot stick 34 to position the shrouded system 10 aadjacent the object to be imaged such as the section of bus pipe 100. Inorder to obtain good quality images of the bus pipe 100, preferably, thesystem 10 a is positioned so that the bus pipe 100 positioned closelyadjacent the digital imager 20 between the X-ray source 18 and thedigital imager 20.

Hot stick 34 may be a so-called shotgun stick known in the art which hasa clamping mechanism (not shown) at its distal or working end 34 a forgrasping the shrouded unit 10 a. It may also be possible to use hotsticks 34 that do not have a clamping mechanism, but, may have a fixedhook or other distal end configuration to couple to base 12, for examplefor engaging closed loops or handles on the base. In such embodiments,an outer surface 30 b of the flexible shroud 30 is provided with acoupling interface 36 which is adapted to receive or engage with thefixed hook or other distal end configuration on the hot stick 34.

Depending on the location of the bus pipe 100 in the electric substation102, various arrangements may be used to position the shrouded system 10a in the described location described above. In one embodiment and withreference to FIG. 5, the hot stick 34 is supported on a quadripod 38through its non-working or handle end 34 b and the shrouded system 10 ais supported or otherwise coupled or connected to the working end 34 aof the hot stick 34. This arrangement is typically used when the buspipe 100 is located in a confined overhead space. The quadripod 38 islocated below an opening in the confined space containing the section ofbus pipe 100 to be imaged. The hot stick 34 aids in vertical insertionand extraction of the shrouded system 10 a into and from the confinedspace. As one skilled in the art will appreciate, a bipod, tripod orother supporting structure may also be used to support the hot stick 34.For increased range of motion of the shrouded system 10 a about workingend 34 a, the shrouded system 10 a may be supported or connected to theworking end 34 a of the hot stick 34 through a universal joint (notshown).

In another embodiment, if there is no opening to the confined overheadspace (where the bus pipe 100 is located) from below the confined space,the bus pipe 100 may be reached from above the confined space asillustrated in FIG. 6. As shown in FIG. 6, the shrouded system 10 a isconnected to the working end 34 a of the hot stick 34 and the hot stickwith the attached shrouded system is suspended from an elevated buckettruck 40 by a lineman 42 located inside the bucket truck 40. The lineman42 may manipulate the non-working end 34 b (the handle) of the hot stick34 in order to position the shrouded system 10 a in the desired positionadjacent the bus pipe 100.

In another embodiment, if the bus pipe 100 is not located in a confinedoverhead space and if the bus pipe is sufficiently strong to support theweight of the shrouded unit 10 a (for example, approximately 50 to 55pounds), the shrouded system 10 a may be suspended from the bus pipe100. In order to enable suspension of the shrouded system 10 a directlyfrom the object to be imaged (e.g. an energized conductor or bus pipe100), the system 10 may be provided with a pair of spaced apartsuspension members. In one embodiment, the suspension members include apair of hooks 44 projecting from each of the opposed short edges 14 a,14 a of the flange 14. In an operative position, the flexible shroud 30will encase all the components of system 10 except the hooks 44.

After the shrouded system 10 a has been maneuvered to the desiredposition adjacent the bus pipe 100, the power supply (not shown)associated with the X-ray source 18 is actuated to produce X-rays. TheX-rays pass through the section of bus pipe 100 located between theX-ray source 18 and the digital imager 20. The digital imager 20captures the X-rays passing through the bus pipe 100 and creates adigital image thereof which is representative of the state of the buspipe 100. The use of the shroud made of barehand suit material enables afirst communication (the X-ray radiation signal) between the X-raysource and the digital imager so as to image the bus pipe 100 positionedtherebetween, and the transmission, for example simultaneously orsequentially, of a second communication (the radio transmission) betweensystem 10 and a remote processor and display such as a remotely locatedlaptop computer.

The wireless interface 26 provides for wireless communication betweenthe shrouded system 10 a and the remote processing unit 28 so as totransmit digital images taken or captured by the shrouded system 10 a tothe remote processing unit 28 for further processing. Again, the remoteprocessing unit 28 may be a computer or a laptop or a mobile digitaldevice. Shroud 30 enables both the first and second signalcommunications.

Applicant contemplates that the system 10 described herein could also beused for non-destructive testing (NDT) of electrical power linecomponents that are not energized. For this application however, wherethe de-energized bus pipe being checked parallels one or more energizedbus pipes, voltages may be induced in the de-energized bus pipe. Inorder to protect the system 10 from electric fields generated due toinduced voltages, in some applications, especially when the bus pipesare in a transmission substation, it may be advisable to use theflexible shroud 30 as described herein.

In experiments to test system 10 a, the shrouded system 10 a was used totake digital (X-ray) images of a section S of an energized electricalconductor (see FIGS. 7A to 7D and 7A1 to 7D1) containing defects in asimulated environment at Applicant's test facility. Defects wereintroduced into the electrical conductor by cutting some of theconductor strands at various locations along the section S. Theelectrical conductor was subsequently energized. One of the objectiveswas to determine whether these defects could be identified from thedigital images taken by the shrouded system 10 a. Another objective wasto determine whether the digital images could be taken without damagingthe various components of the shrouded system 10 a.

The following observations were made:

-   1. The defects were easily identifiable from the digital images    taken by the shrouded system 10 a. FIGS. 7A to 7D (as sated above,    7A1 to 7D1 are line drawing depictions of the X-ray images of 7A to    7D) are the digital images taken by the shrouded system 10 a of the    defective energized conductor section S. For ease of identification,    areas of the energized conductor section S containing the defects    (i.e. cut in the conductor strands) have been circled in FIGS. 7A to    7D and FIGS. 7A1 to 7D1.-   2. Further, the digital images were taken by the shrouded system 10    a without any damage to its components.-   3. It is postulated that the barehand suit material forming shroud    30 may be close to being an optimized form of Faraday shield in the    sense that it allows both RF communication through it, and nearly    interference-free X-ray transmission from the X-ray source and    reception by the digital imager through it also, while providing    protective shielding of the system in a highly energized environment    due to the high voltage in the object to be imaged.

What is claimed is:
 1. A system for non-destructive testing of anenergized electrical component which is supported in an overheadposition in an electrical power line system, the system comprising: anelongate base having a first end and a second end and a lengththerebetween; an X-ray source adapted to be mounted on the base at aboutits first end; an X-ray digital imager adapted to be mounted on the baseat about its second end, wherein the X-ray source and the X-ray digitalimager, when so located, are in an operative opposed facing spatialrelationship; an imager controller adapted to be mounted to the base;and a removable electrically conductive flexible shield adapted to beoperatively coupled to, and to encapsulate, at least the base, the X-raysource, the X-ray digital imager and the imager controller, the shieldbeing further adapted to be releasably coupled to a live-line tool, andwherein, when the shield is coupled to and encapsulates at least each ofthe base, the X-ray source, the X-ray digital imager and the imagercontroller to form a shrouded system, and the shrouded system isreleasably coupled to the live-line tool, the shrouded system ispositionable adjacent the energized electrical component so as tonon-destructively test the energized electrical component whileshielding at least the base, the X-ray source, the X-ray digital imagerand the imager controller from electric fields around the energizedelectrical component and allowing at least one signal communicationbetween the shrouded system and an external component.
 2. The system ofclaim 1, wherein the external component is the energized electricalcomponent and the at least one signal communication includes a firstsignal communication between at least the X-ray source and the energizedelectrical component.
 3. The system of claim 1, wherein the shield is aflexible form-fitted woven cover which includes inter woven electricallyconductive threads.
 4. The system of claim 3, wherein electricallyconductive threads are metallic threads.
 5. The system of claim 1,wherein the base is a T-shaped plate in plan view and includes a flangeand an elongate leg extending perpendicularly from a center of theflange, and wherein the first end of the base is defined by an outer,free end of the leg distal from the flange, and the second end of thebase includes the flange.
 6. The system of claim 5, wherein the basefurther comprises a support plate underlying the leg and extending atleast along a length thereof.
 7. The system of claim 6, wherein theimager controller is mounted on the support plate.
 8. The system ofclaim 3, wherein the flexible cover includes one or more electricallyconductive flexible fastening elements on an inside surface thereof forelectrically conductive coupling of the flexible cover to at least thebase, the X-ray source, the digital imager and the imager controller. 9.The system of claim 8, wherein an outside surface of the flexible coverincludes at least one coupling interface which is adapted to receive,engage or couple with the live-line tool.
 10. The system of claim 3further comprising a communication interface to communicate with aremote processing unit.
 11. The system of claim 10, wherein the flexiblecover is further adapted to be operatively coupled to the communicationinterface and encapsulate the communication interface during use. 12.The system of claim 11, wherein the communication interface is awireless interface.
 13. The system of claim 12, wherein the externalcomponent is the remote processing unit and the at least one signalcommunication includes a second signal communication between theencapsulated communication interface and the remote processing unit. 14.The system of claim 4, wherein the woven cover is formed in aherringbone pattern having a repetitive weave in the range ofsubstantially 10 mm to 20 mm.
 15. A method for non-destructive testingof an energized electrical component which is supported in an overheadposition in an electrical power line system, the method comprising:locating an X-ray source and an X-ray digital imager on an elongate basein an opposed facing spatial relationship; connecting an imagercontroller to the base; encapsulating at least each of the base, theX-ray source, the X-ray digital imager and the imager controller withina removable electrically conductive flexible shield to form a shroudthereover; releasably coupling a live-line tool to the shroud;manipulating the live-line tool to position the shroud adjacent theenergized electrical component for non-destructive testing of theenergized electrical component while shielding at least the base, theX-ray source, the X-ray digital imager and the imager controller fromelectric fields around the energized electrical component and allowingat least one signal communication between the shroud and an externalcomponent.
 16. The method of claim 15, wherein the external component isthe energized electrical component and non-destructive testing of theenergized electrical component includes taking at least one digitalimage of the energized electrical component by allowing a first signalcommunication in the X-ray bandwidth between the shroud and theenergized electrical component.
 17. The method of claim 15, wherein thestep of encapsulation further comprises encapsulating at least each ofthe base, the X-ray source, the X-ray digital imager and the imagercontroller within a removable electrically conductive flexibleform-fitted cover.
 18. The method of claim 15 further compriseswirelessly transmitting the at least one digital image via a wirelessinterface located on the base.
 19. The method of claim 18, wherein theexternal component is a remote processing unit and wirelesslytransmitting includes allowing a second signal communication in theWi-Fi bandwidth between the shroud and the remote processing unit.